A combined total of 342 diplomats have been expelled and sent back to their home countries since the alleged nerve-gas attack on former double agent Sergei Skripal in the UK.

The recent wave of explusion of diplomats comes days following the poisoning of former Russian spy Sergei Skripal and his daughter Yulia. London says Moscow was behind the attack - an allegation Russia denies.

Russia has expelled 189 diplomats from various countries in retaliation for the wave of ejections of Russian officials. A total of 342 diplomats have been expelled and returned to home countries.